Clamp for concrete forms



July 18, 1944.

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S 10 In D562 J. w. KEFFER CLAMP FOR CONCRETE FORMS Filed Feb. 2'7, 19452 Sheets-Sheet l E i ET? H w j I 3 H ""A @a if g I 4 5 l1 5L] 11 15lNVEl NTOR I. J05 e oh WKcffer Attorneys July 18, 1944. J, w KEFFER2,353,831 3 CLAMP FOR CONCRETE FORMS Filed Feb. 27, 1943 2 Sheets-SheetZofl 10 10 INVENTOR Attofll eys Jaseph Wlfeff e1 Patented .I uly 18, 19442,353,831 CLAMP FOR; coNoRETEiEo-RMs Joseph W; Kcfier, Ligonier, Pa.Application February 27, 1943, Serial N6. 477,407 1 Claim, (01. 144-291This invention is an improvement in clamps for concrete forms, of thegeneral type disclosed in my prior Patents Nos. 1,590,033 and 1,765,235.

As therein shown and described, and as here, the

objects in vieware to efiect accurate adjustment of the confining wallssurrounding the pouring "cavity. Ordinarily such walls are of verticallyarranged planks or the like, as in column formation, usuallyre-assembledafter use. l

' -The patents noted utilize successive series of .double pairs ofpivotally connected members or arms, adapted to be laid around theexterior generally rectangular surface'contour of the forms, havingedgewise contact by successive sets of pairs with the forms, andaccurately tightened thereagainst. The free ends of the arms cross leachother, in under and overlapping arrange- I'nent, at diagonally oppositecorners, diagonally between their alternating pivot or hingeconnections. Such construction admits of easy application and removal,together with the adjusting and connecting elements, called bearingblocks.

Such bearing blocks are slidably mounted in duplicate on theclamping-arms for mutual cooperation, at said diagonally oppositecorners,

and are effective in thrusting each of the several arms longitudinallyand inwardly edgewise, for final correct positioning against the forms.

The tightening adjustment is effected by wedg-. 'ing strains, urgingeach block of a cooperating pair inwardly along its particular clampingarm, and against the companion cross arm, each of such armsbeing one ofa pivotally connected 'pair. Simultaneously a reverse outward pullingstrain isexerted on eachsuch arm, tending to 'set the hinge'jointterminals accurately around and against the corners of the forms,edgewise. The present construction utilizes the provision of soconstructing the blocks as to avoid confusion or error in application tothe arms, and

to secure interaction between pairs of blocks, igenerally as disclosedheretofore. improvement embodies additional important fea- "tures ofconstruction and operation, as herein- The present after described. Suchfeatures relate to strengthening bracing reinforcement of the blocks andto features of construction facilitating identification of theiraccurate placement, in use.

In the drawings:

7 Fig. 1 is a somewhat diagrammatic plan view,-

illustrating my improved block construction, in operative positions;

Fig. 2 is an enlarged detail plan view showing a corner assembly of theworking members in position;

Fig. 3 is a longitudinal vertical sectional view .on the line IIIIII ofFig. 2;

like Big. 3, andan end view"respeotively-, illustratingcomparativepositions of a pairof blocks, for co-operation with the freeends of clampin arms, crossing at differentlevels.

Generally stated, the invention is:particularly adapted to the problemof adjusting the molding forms for square or other rectangular concreteconstructions, as columns .or pillarsr In such operations, the aggregateis poured into a shapedefining cavity within confining and moldingwalls- 2;

These are-usually of wooden planks or other suitable material, arrangedvertically and requiring exterior confining and bracing elements foradjustment and continuously proper placement.

For such purpose I utilize series of duplicate sets, consisting of pairsof flat metal arms or bars 3, 3a, each pair being pivotally connected at4',

forscorner engagement.

These pivotally connected arms are arranged as shown, loosely around theforms, with the free end portions of on arm of a pair overorunderlapping the end of blocks A, A, located in position on the bars 3and 3a, as in Fig. 1., Each block is a duplicate of the other, and maybe placed slidably along its bar 3.or 3a, with either of its top andbottom faces'upwardly, the blocks being equally operative in eitherposition.

Each block is operatively related to the other, in side face contact byeither pair, when assembled onthe free ends of the converging bars, andthrust together, as shown in Fig. 1. f

Obviously, one of said bars being laid over the other, as 3 over 3a, orvice versa, the duplicate blocks of a pair will occupy slightly variablepositions vertically, corresponding to the upper and lower planes of thebars, such variation ordi-

